On this day: September 1

The last passenger pigeon dies, World War II begins, the Soviet Union shoots down a Korean airliner, and the wreck of the Titanic is discovered, all on this day.

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MGM

2013: Former professional boxer and actor Tommy Morrison dies at age 44 in Omaha, Nebraska. Morrison, who lost only three out of a total of 52 professional fights and beat George Foreman for the vacant World Boxing Organization heavyweight championship in June 1993, starred opposite Sylvester Stallone in 1990's "Rocky V" (pictured). He retired from boxing in 1996 when he tested positive for HIV, but made a comeback in 2006, claiming he had tested negative for HIV. While his mother had said less than a month before his death that Morrison was in his final days with "full-blown AIDS," his death certificate listed his causes of death as cardiac arrest, septicemia, Pseudomonas aeruginosa and multiorgan failure.